Vaginal fistula, (particularly due to diverticular disease), Crohn's disease or carcinoma of the colon or bladder, instrumentation and after trauma are other causes of gas production, and differential diagnosis should be made with emphysematous cystitis.olovesical fistula, a fistula connecting the colon and the urinary bladder. Also called vesicocolonic fistula. 1  Facebook. 2  Twitter.
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